Abstract
Brown-chested Martins (Phaeoprogne tapera) at Guanare, Venezuela, have a clutch size of 4.0 ± 0.2 (SE) eggs, smaller than that reported for the Purple Martin (Progne subis), a temperate species. The eggs are incubated for 62.4% of the daylight hours; incubation periods are longer at low ambient temperatures. Nestling Brown-chested Martins do not lose weight near fledging; the growth rate constant is 0.284. On a biomass basis, Brown-chested Martins bring more dragonflies to the nest than reported for Purple Martins; relatively more dragonflies are brought as the nestlings grow. Cool, wet, and cloudy weather reduces feeding activity and the rate at which food is gathered by the tropical martin, as has been reported for the temperate species.
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